If some understand why my app never go in my last function, or can explain me how catch the response or any suggestion I will really appreciate.

I'm on it since 3 days, and I really don't know what to do...

(I also post in the Ext.Direct part because I don't know if it's an Ext.Direct problem, or if that's because I don't understand extjs callback function. I will delete 1 of these 2 post when I'll understand my problem)
(Sorry for my bad english )